Originally Posted by mberndt

No, it's not Hondas fault, it is simply humidity...

When it rains, the humidity in the air increases. If you do not have an Air Conditioner, you may not be able to stop the fogging of your windows.

It's called air CONDITIONING because it does more than just cool the air, it also removes the humidity from the air. Have you ever activated an A/C system with the heat also? It will produce DRY hot air, that will clear up the humid atmosphere in the cabin. BMW and Audi and other expensive cars, automatically use the A/C to de-humidify the cabin. On some Honda's using the defroster setting on the windshield also turns on the A/C system, cause without it you cannot remove the moisture from the air, hence the fogged up windows (does this on my prelude, but not on my civic). Plus considering you are exhaling hot, humid air when you breathe it doesn't help the situation. This is because you are making the cabin more hot and humid than the outside atmosphere.

So, apart from some magical cleaner to stop the fogged windows, either you must drive with the window down, or if it is cold outside, you can use the heat setting to do the same thing that the A/C does, which is provide enough of a temperature difference to cause the moisture in the air to collect on the grid inside of the heater core, therefore reducing the humidity.

Same problem that us snowboarders face, our goggles fog up cause our body is giving off too much heat, and the outside temp is much colder.

Ahh yes, the snowboarding season is soon upon us... Well in PA anyway...